So I narrowed down at least one problem and I could use some guidance again..By commenting out the following line in "suppliersadmin.php," I was able to get the form allowing me to add a supplier to show.
$contents[] = array('text' => '<br>' . TEXT_SUPPLIERS_CATEGORIES . '<br>' . tep_draw_mselect_menu('categories[]', $categories, $categories_selected));
I've added the function being called (tep_draw_mselect_menu) to html_output.php as directed in the install txt file. I'm not sure if the call is sending the information the function is expecting.
html_output.php code
function tep_draw_mselect_menu($name, $values, $selected_vals, $params = '', $required = false) {
suppliersadmin.php function call
tep_draw_mselect_menu('categories[]', $categories, $categories_selected));
I'm wondering which parameter(s) is causing the problem. Any assistance would be appreciated.